Yes Method had been consistently top 3 for a long time but never 1st until now. BL has been consistently top 10 and never first until now. They both have a fair amount of world first kills leading up to the final bosses.

Also ALL GUILDS had the same amount of time on a killable zor'lok while BL was not even 1/6 while method and paragon were already 3/6. Thus BL cleared the instance faster than everyone by a margin since they weren't even wasting time raiding before the hotfix on that day. Even if you want bring in the time zone differences and releases of the instance ignoring the fact that BL got to spend an extra day bashing their head against the wall on a pre-hotfix zorlok. Method took 18 hours to get a kill after BL which is the difference in releases as well.

Method killed Lady Vashj World first Legit not like Nihilum hardcore exploiting it

I think Midwinter is prolly the best 25 man guild out there they went from US 20th kills in one expansion then up to US 10th kills and now they are up to US 3rd kills and are now ranked world 17th.
They have made tons of progress since I first started playing on Ysera and will probably keep rooting for them until WoW ends.

Can anyone remind me why it's so important to quickly finish the game (and then nag there's not enough content)?

Those that finish the content fast don't nag.

You will see way more nagging about Garalon LFR eddition.
As for the rest of us that we re keeping track of what the best in this game are doing, you may call it natural reaction. People are entertained by keeping track of "how the best are doing" at smt they enjoy, even watching their videos on the encounters.